Joint Tactical Radio System(JTRS) is an important communication equipment for all levels of cyberspace capabilities development and construction for US army, which is the major initiative for realizing the advantages of tactical cyberspace. The overview of JTRS is expounded, including the radio evolution and specification of Software Communication Architecture(SCA) standard. Then the radio station of JTRS architecture and typical networking construction are studied in detail. The primary waveforms and related radio stations of JTRS are analyzed and the latest developments are expected. This work can provide reference for the development of new tactical Internet and software defined radio.